Nuwa's Mortal Realm has been breached, and ancient ferocious beasts have appeared in the human world. A descendant of Nuwa breaks through the restrictions and ascends to the Ninth Heaven to seek help. By chance, Nuwa's descendant Yu Li meets Shu Yu, who roams beyond the Celestial Realm. Over the course of several days together, they come to understand each other better. As they discuss their respective backgrounds, Shu Yu, who has long lived in the Celestial Realm, becomes aware of his awkward position there and gradually begins to doubt his own origins. He constantly seeks to break free from the Celestial Realm's constraints and the Heavenly Lord's control, insisting on descending to the Ninth Heaven to uncover the truth behind the breach of the Mortal Realm. The Heavenly Lord fails to talk him out of it and reluctantly lets him go to the human world. Though the Six Realms are calm on the surface, undercurrents still surge, so the Heavenly Lord can only keep watch over Shu Yu's movements in secret. After countless twists and turns, he returns to the Ninth Heaven no longer the naive boy he once was. He has become the Heavenly Lord's most trusted right-hand man, yet no one knows that he has endured one heartbreaking separation after another...
